Joe F: ???. No, it's there. Honest! THE BIG ROCK CANDY MOUNTAIN. Since no tune is indicated, I sing it basically to the BRCM chorus. That seems right & as intended.

There's an interesting line in the penultimate verse, And he called me his jocker. Note that generally, the bum is the "jocker." Perhaps a pet name for the boy or perhaps implying a different position than missionary.